.\"	$NetBSD: mincore.2,v 1.7 1995/10/12 15:41:05 jtc Exp $
.\"
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.\"	@(#)mincore.2	8.1 (Berkeley) 6/9/93
.\"
.Dd June 9, 1993
.Dt MINCORE 2
.Os
.Sh NAME
.Nm mincore
.Nd determine residency of memory pages
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <sys/mman.h>
.Ft int
.Fn mincore "caddr_t addr" "size_t len" "char *vec"
.Sh DESCRIPTION
The
.Fn mincore
system call
allows a process to obtain information about whether pages are
core resident.
The current core residency of the pages is returned
in the character array 
.Fa vec .
For each entry in the character array
.Fa vec ,
the following bit values may be set
depending upon the state of the page:
.Bd -literal -offset indent
.nf
MINCORE_INCORE           0x1     /* Page is incore */
MINCORE_REFERENCED       0x2     /* Page has been referenced by us */
MINCORE_MODIFIED         0x4     /* Page has been modified by us */
MINCORE_REFERENCED_OTHER 0x8     /* Page has been referenced */
MINCORE_MODIFIED_OTHER  0x10     /* Page has been modified */
.fi
.Ed
.Sh RETURN VALUES
Upon successful completion,
a value of 0 is returned.
Otherwise, a value of -1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
.Bl -tag -width Er
.\" ===========
.It Bq Er EINVAL
.Fa addr
is not a valid address for user mode.
.\" ===========
.It Bq Er EFAULT
an error occurred trying to copy to the output character array
.Fa vec .
.El
.Sh SEE ALSO
.Xr madvise 2 ,
.Xr minherit 2 ,
.Xr mlock 2 ,
.Xr mprotect 2 ,
.Xr msync 2 ,
.Xr munmap 2
.Sh HISTORY
The
.Fn mincore
function first appeared in 4.4BSD.